I recently purchased an Ace Shaving Silvertip Brush - which has turned out to be quite excellent. I have posted my review here.

Brush experts like GD Carrington have long praised Ace knots but there aren't many reviews of brushes entirely made by Ace. I bought it on a lark and have been very impressed with the results. I submit that if low cost manufacturers/retailers like Ace deliver & maintain quality at this level - it is difficult to justify a $200 Kent BK8 (or similar) based on functionality alone.

For Silvertip fans - Ace Brushes are worth a look.
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p.s. I have no affiliation with Ace Brushes and paid full price for my brush just as a regular consumer.